22505244522421 has 2 divisors, whose sum is σ = 22505244522422. Its totient is φ = 22505244522420.

The previous prime is 22505244522401. The next prime is 22505244522437. The reversal of 22505244522421 is 12422544250522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16915041584100 + 5590202938321 = 4112790^2 + 2364361^2 .

It is a cyclic number.

It is not a de Polignac number, because 22505244522421 - 2⁵ = 22505244522389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22505244522401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11252622261210 + 11252622261211.

It is an arithmetic number, because the mean of its divisors is an integer number (11252622261211).

Almost surely, 2^{22505244522421} is an apocalyptic number.

It is an amenable number.

22505244522421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22505244522421 is an equidigital number, since it uses as much as digits as its factorization.

22505244522421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512000, while the sum is 40.

Adding to 22505244522421 its reverse (12422544250522), we get a palindrome (34927788772943).

The spelling of 22505244522421 in words is "twenty-two trillion, five hundred five billion, two hundred forty-four million, five hundred twenty-two thousand, four hundred twenty-one".